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The characteristics of quenched and tempered steel as edge tooth material
When quenched and tempered steel is used as the edge tooth material for construction machinery, its core characteristic lies in achieving a balance between strength and toughness through the quenching + high-temperature tempering process. The specific characteristics are as follows:
I. Core performance advantages
Comprehensive balance of strength and toughness
Medium carbon content (0.25%-0.6%) after quenching and tempering treatment (quenching + high-temperature tempering), a tempered sorbite structure is formed, which also has:
Tensile strength 1000-1200 MPa (such as 1.6510 steel)
Impact energy ≥40 J, effectively absorbs dynamic impact load
It is suitable for gear and shaft components subjected to alternating stress, avoiding the risk of heavy-load fracture
The core has outstanding impact resistance
Core hardness HRC 30-40 (compared with the hard surface of carburized steel HRC 58-62) , with better toughness reserve, especially suitable for:
Light and medium load conditions such as earthwork and sand and gravel
Low-temperature operating environment (such as maintaining toughness at -20℃)
⚙️ II. Adaptability to working conditions and limitations
Features Advantages limitations
Wear resistance The surface can be induction hardened to HRC 48-52, meeting the wear requirements of light loads is lower than that of carburized steel (HRC 58-62), and is not suitable for heavy ore loads
Process stability heat treatment deformation rate ≤ 0.05% (e.g. 25Х gm steel) to ensure assembly accuracy, preheating is required for welding, and the process complexity is high
Economic efficiency The material cost is 30%-40% lower than that of carburized steel , and it has excellent processing performance (annealed hardness of 200 HBW) the service life in heavy-load scenarios is only 1/3 of that of carburized steel
III. Key parameters and selection suggestions
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# Technical Specification for Quenched and Tempered Steel Edge Teeth
- ‌ ** Typical Grade **‌ :
- Medium and high loads: 1.6510(39NiCrMo3), 42CrMo
- Low-temperature environment: 25Х gm (low deformation property) :ml-citation{ref="2" data="citationList"}
- ‌ "Heat treatment requirements" ‌ :
Quenching: Oil cooling at 840-850℃ → martensitic transformation
- Tempering: Slow cooling at 550-650 ° C → stress relief, toughness adjustment :ml-citation{ref="1" data="citation list "}
- ‌ ** Performance threshold **‌" :
Tooth surface hardness: ≥ ‌ **45 HRC**‌ (After induction hardening
Core impact energy: ≥ ‌ **35 J**‌ (ISO 148 standard)
Application tips : In scenarios such as earthmoving machinery where impact loads are greater than wear loads, quenched and tempered steel can reduce the risk of fracture due to its excellent core toughness, but it is necessary to avoid the working conditions of super-hard materials .
The characteristics of quenched and tempered steel as edge tooth material
When quenched and tempered steel is used as the edge tooth material for construction machinery, its core characteristic lies in achieving a balance between strength and toughness through the quenching + high-temperature tempering process. The specific characteristics are as follows:
I. Core performance advantages
Comprehensive balance of strength and toughness
Medium carbon content (0.25%-0.6%) after quenching and tempering treatment (quenching + high-temperature tempering), a tempered sorbite structure is formed, which also has:
Tensile strength 1000-1200 MPa (such as 1.6510 steel)
Impact energy ≥40 J, effectively absorbs dynamic impact load
It is suitable for gear and shaft components subjected to alternating stress, avoiding the risk of heavy-load fracture
The core has outstanding impact resistance
Core hardness HRC 30-40 (compared with the hard surface of carburized steel HRC 58-62) , with better toughness reserve, especially suitable for:
Light and medium load conditions such as earthwork and sand and gravel
Low-temperature operating environment (such as maintaining toughness at -20℃)
⚙️ II. Adaptability to working conditions and limitations
Features Advantages limitations
Wear resistance The surface can be induction hardened to HRC 48-52, meeting the wear requirements of light loads is lower than that of carburized steel (HRC 58-62), and is not suitable for heavy ore loads
Process stability heat treatment deformation rate ≤ 0.05% (e.g. 25Х gm steel) to ensure assembly accuracy, preheating is required for welding, and the process complexity is high
Economic efficiency The material cost is 30%-40% lower than that of carburized steel , and it has excellent processing performance (annealed hardness of 200 HBW) the service life in heavy-load scenarios is only 1/3 of that of carburized steel
III. Key parameters and selection suggestions
markdown
Copy Code
# Technical Specification for Quenched and Tempered Steel Edge Teeth
- ‌ ** Typical Grade **‌ :
- Medium and high loads: 1.6510(39NiCrMo3), 42CrMo
- Low-temperature environment: 25Х gm (low deformation property) :ml-citation{ref="2" data="citationList"}
- ‌ "Heat treatment requirements" ‌ :
Quenching: Oil cooling at 840-850℃ → martensitic transformation
- Tempering: Slow cooling at 550-650 ° C → stress relief, toughness adjustment :ml-citation{ref="1" data="citation list "}
- ‌ ** Performance threshold **‌" :
Tooth surface hardness: ≥ ‌ **45 HRC**‌ (After induction hardening
Core impact energy: ≥ ‌ **35 J**‌ (ISO 148 standard)
Application tips : In scenarios such as earthmoving machinery where impact loads are greater than wear loads, quenched and tempered steel can reduce the risk of fracture due to its excellent core toughness, but it is necessary to avoid the working conditions of super-hard materials .
